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Turnbull, G.A., Robertson, D.A., Smith, G.M., et al. (1996) The Generation of Free-Space Laguerre-Gaussian Modes at Millimeter-Wave Frequencies by Use of a Spiral Phaseplate. Optics Communications, 127, 183-188.
https://doi.org/10.1016/0030-4018(96)00070-3

has been cited by the following article:

• TITLE: Improved Directivity of an OAM Antenna by a Fabry-Perot Cavity: An Experimental Study

  AUTHORS: Wenlong Wei, Wenlin Kuai, Kourosh Mahdjoubi, Christian Brousseau, Olivier Emile

  KEYWORDS: Circular Antenna Array, Fabry-Perot Cavity, Orbital Angular Momentum, Patch Antenna, Phase Shifter

  JOURNAL NAME: Open Journal of Antennas and Propagation, Vol.9 No.4, December 28, 2021

  ABSTRACT: The circular phased antenna array is commonly used for generating waves bearing Orbital Angular Momentum (OAM) in the radio frequency band, but it achieves a relatively low directivity. To overcome this drawback, we present here a method to improve the directivity of an OAM circular phased antenna array by embedding it inside a Fabry-Perot cavity. The Fabry-Perot cavity contains three main parts: a partially reflecting surface (PRS), an air cavity and a ground plane. Simulation data show that the directivity of this new OAM antenna achieves an improvement of 8.2 dB over the original array. A prototype is realized and characterized. The simulated and measured characteristics are in good agreement.